Fig. 5

Magnetization curves of (a) Fe₃O₄, (b) Fe₃O₄@SiO₂, and (c) Fe₃O₄@SiO₂/Schiff-base/Zn (II), (d) magnetic characteristic image of Fe₃O₄@SiO₂/Schiff-base/Zn (II); TGA spectra of (e) Fe₃O₄, (f) Fe₃O₄@SiO₂ and (g) Fe₃O₄@SiO₂/Schiff-base/Zn (II) MNC.